The hex color #4fea11 is a light color. The web-safe version is Hex
#66FF00. A complementary color is
#B015EE. The grayscale version is
#6E6E6E. A 20% lighter version of the original color is
#82FF44, and Hex
#1CB700 is the 20% darker color. If the color is saturated by 10%, you get
#4CF608. If the color is desaturated by 10%, the color
#52DE1A is obtained.